JP2010105120A - Stepped drill polishing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stepped drill polishing device capable of polishing a small diameter part and a large diameter part of a stepped drill by a single device and easy operation while being inexpensively manufactured with a simple mechanism. <P>SOLUTION: The drill polishing device comprises a small diameter part polishing mechanism 100 for polishing the small diameter part and a large diameter part polishing mechanism 200 for polishing the large diameter part. The small diameter part polishing mechanism comprises a rotating grinding wheel 10 for polishing the small diameter part, a second surface polishing mechanism 20, a third surface polishing mechanism 30, and a thinning forming mechanism 40 which are respectively set to make a tip of the small diameter part of the drill contact a rotating grinding wheel for polishing the small diameter part at predetermined different angles. The large diameter part polishing mechanism comprises a rotating grinding wheel 50 for polishing the large diameter part, and a flank polishing mechanism 60 which is set to make a flank at a tip of the large diameter part of the drill contact the rotating grinding wheel for polishing the large diameter part at a predetermined angle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a stepped drill polishing apparatus capable of re-polishing a stepped drill when it is worn.

Conventional general drills consist of a part that attaches to a processing machine called a shank part and a blade part that forms a groove part from the tip to the shank part. Such a drill is simply used to make a circular hole. ing.
However, with such a general drill, although drilling is possible, when drilling a hole, such as chamfering, countersinking, or countersinking, a drill with a different diameter is used. Work efficiency is very bad.
Therefore, in order to improve work efficiency, drilling and chamfering, drilling and counterbore, drilling and countersinking can be performed at the same time, and a single step drill with two functions (see, for example, Patent Document 1 below) Is widely used mainly in the automobile industry.

  As shown in FIG. 24, the stepped drill has a small diameter portion (A) having the same shape as a general drill and a large diameter portion (B) that is thicker than a small diameter portion having a blade edge that is horizontal or at an angle of about 90 °. And a shank portion (C) held by a processing machine or the like.

When such a step drill is worn with use, it may be used after being reground as with a general drill.
However, there is currently no dedicated machine for re-grinding stepped drills in the market, and the user uses an expensive CNC tool grinder or a complicated and troublesome universal tool grinder for re-polishing. There was only a way to do it.

JP 2002-79408 A

  The present invention has been made to solve the above-described problems of the prior art, and it is possible to polish a small diameter portion and a large diameter portion of a step drill with a simple operation using a single device. The present invention proposes a stepped drill polishing apparatus that can be provided at a low cost with a simple mechanism.

  The invention according to claim 1 is a polishing apparatus for a stepped drill having a small diameter portion, a large diameter portion, and a shank portion, and a small diameter portion polishing mechanism for polishing the small diameter portion, and a large diameter portion for polishing the large diameter portion. The small-diameter portion polishing mechanism is capable of abutting the small-diameter portion polishing grindstone and the tip of the small-diameter portion of the drill at different predetermined angles with respect to the small-diameter portion grindstone. A set second surface polishing mechanism, a third surface polishing mechanism, and a thinning forming mechanism, wherein the large diameter portion polishing mechanism includes a rotary grindstone for polishing a large diameter portion, and a tip portion of a large diameter portion of the drill. The present invention relates to a polishing apparatus for a stepped drill, characterized in that it has a flank polishing mechanism set so that the flank can be brought into contact with the rotating grindstone for polishing a large diameter portion at a predetermined angle.

  The invention which concerns on Claim 2 has a holder which can hold | maintain the said drill in the state which maintained the blade edge | tip in the fixed direction, The said 2nd surface grinding | polishing mechanism, the said 3rd surface grinding | polishing mechanism, and the said thinning formation mechanism are A block having a holder insertion through-hole through which the holder is inserted, and a fixing mechanism capable of fixing the holder inserted through the holder insertion through-hole. The step drill drill polishing apparatus according to claim 1, wherein when the holder is inserted and fixed, a tip portion of the drill comes into contact with the small diameter portion polishing rotary grindstone at a predetermined angle.

  According to a third aspect of the present invention, there is provided a contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in a holder insertion through hole of a block of the second surface polishing mechanism, and the third surface The step according to claim 2, wherein the contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in the holder insertion through hole of the block of the polishing mechanism is the same point. The present invention relates to a drill polishing apparatus.

  The invention which concerns on Claim 4 has a holder which can hold | maintain the said drill in the state which maintained the blade edge | tip in the fixed direction, The said flank grinding | polishing mechanism is a through-hole for holder insertion in which the said holder is penetrated, A rotation angle restricting mechanism for restricting the holder inserted through the holder insertion through hole so as to be rotatable by a predetermined angle, and when the holder is inserted and fixed in the holder insertion through hole of the block 2. The flank of the drill abuts against the rotating grindstone for polishing a large-diameter portion at a predetermined angle, and the drill advances in the axial direction when the holder is rotated by a predetermined angle. The present invention relates to a step drill polishing apparatus.

  The invention according to claim 5 is the step drill according to claim 4, wherein the amount of advance in the axial direction of the drill with respect to the amount of rotation of the holder is small at the initial stage of rotation and increases as it approaches the final stage. The present invention relates to a polishing apparatus.

  In the invention according to claim 6, the holder has a collet chuck that holds the shank portion of the drill on a distal end side, and a shaft portion that is inserted into the holder insertion through hole on a proximal end side, On the outer peripheral surface of the shaft portion, a ring that can move in the length direction and the circumferential direction of the shaft portion and can be fixed to a required position is fitted, and the ring has a groove in a part of the circumferential direction. The fixing mechanism includes a pin protruding from an end face of the block, and the circumferential position of the ring with respect to the block is defined by fitting the pin into the groove. The polishing apparatus for a step drill according to Item 2.

  The invention according to claim 7 has a first adjustment mechanism for adjusting the direction of the cutting edge of the small-diameter portion of the drill when holding the drill with respect to the holder, An adjustment block comprising a holder insertion through-hole through which the holder is inserted, and a fixing mechanism capable of fixing the holder inserted through the holder insertion through-hole, and is movable in a direction perpendicular to the drill axis, The blade tip stopper according to claim 1, wherein a tip of the tip is set by contacting the tip of the small diameter portion of the drill held by a holder inserted through the adjustment block. 2. The polishing apparatus for a step drill according to 2.

  The invention according to claim 8 has a second adjustment mechanism for adjusting the orientation of the cutting edge of the large diameter portion of the drill when the drill is held with respect to the holder, and the second adjustment mechanism includes: When the holder is inserted and fixed in the holder insertion through hole of the block of the flank polishing mechanism, it has an edge detection stay for setting the direction of the blade edge by contacting the blade edge and the groove of the large diameter portion. The polishing apparatus for a step drill according to claim 4.

  The invention according to claim 9 relates to the polishing apparatus for stepped drills according to claim 8, wherein the edge detection stay is attached to a tip of an arm that can be raised and lowered.

  According to a tenth aspect of the present invention, the second adjustment mechanism has a rotation mechanism that rotates the block of the flank polishing mechanism around a contact point between the large-diameter portion polishing grindstone and the drill. 10. The polishing apparatus for a step drill according to claim 8 or 9, wherein

  According to an eleventh aspect of the present invention, the large-diameter portion polishing mechanism includes a slide mechanism that slides the block of the flank polishing mechanism in a direction perpendicular to the rotation axis of the large-diameter portion polishing grindstone. The present invention relates to a polishing apparatus for a step drill according to any one of claims 1 to 10.

  According to the first aspect of the present invention, the second surface polishing mechanism, the third surface polishing mechanism, and the thinning forming mechanism abut the tip portion of the small diameter portion of the drill against the rotating grindstone for polishing the small diameter portion at different predetermined angles. In addition, the flank grinding mechanism is set so that the flank at the tip of the large-diameter portion of the drill can be brought into contact with the rotary grindstone for polishing the large-diameter portion at a predetermined angle. A device capable of easily polishing a small diameter portion and a large diameter portion of a drill with a single device can be provided at a low cost with a simple mechanism.

  According to the second aspect of the present invention, after holding the cutting edge of the drill in a fixed direction by the holder, the holder is inserted through the holder insertion through-hole and fixed by the fixing mechanism. Since the tip portion can be brought into contact with the rotating grindstone for polishing the small diameter portion at a predetermined angle, the cutting edge of the small diameter portion of the drill can be accurately polished without requiring any complicated operation.

  According to the third aspect of the invention, the contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in the holder insertion through hole of the block of the second surface polishing mechanism, and the third surface polishing mechanism The contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in the holder insertion through-hole of the block is the same point, so that the space required for polishing the small-diameter portion is minimized and The third surface can be formed, and the apparatus can be reduced in size.

  According to the invention of claim 4, after holding the cutting edge of the drill in a fixed direction by the holder, the holder is inserted into the holder insertion through-hole so that the flank face of the drill is Since the drill can be advanced in the axial direction by contacting the grinding wheel at a predetermined angle with a predetermined angle and rotating the holder by a predetermined angle regulated by the rotation angle regulating mechanism, no complicated operation is required. The flank of the large diameter portion of the drill can be accurately polished without the need.

  According to the fifth aspect of the present invention, the amount of advance in the axial direction of the drill with respect to the amount of rotation of the holder is small at the initial stage of rotation and increases as it approaches the final stage. Flank shape can be obtained.

  According to the invention of claim 6, the circumferential direction position of the ring with respect to the block is defined by utilizing the groove of the ring that is externally fitted and fixed to the holder, and the pin that protrudes from the block end surface. It is possible to easily and accurately set the direction of the drill blade edge when the holder is inserted through the holder.

  According to the invention which concerns on Claim 7, the direction of the blade edge | tip of a drill tip can be set by moving a blade edge | tip stopper in the state which inserted the holder holding the drill in the holder insertion through-hole of the adjustment block. Therefore, it is possible to accurately set the direction of the cutting edge of the small diameter portion of the drill with respect to the holder.

  According to the invention according to claim 8, when the holder is inserted and fixed in the holder insertion through hole of the block of the flank polishing mechanism, the edge that sets the direction of the blade edge by abutting against the blade edge and the groove of the large diameter portion Since the detection stay is provided, the direction of the cutting edge of the large diameter portion of the drill can be accurately set with respect to the holder.

  According to the ninth aspect of the present invention, the edge detection stay is attached to the tip of the arm that can be raised and lowered, so that the arm does not get in the way except when adjusting the direction of the cutting edge of the large diameter portion of the drill. Can be raised. Therefore, the space occupied by the second adjustment mechanism on the apparatus can be reduced, and the apparatus can be reduced in size.

  According to the tenth aspect of the present invention, the second adjustment mechanism has a rotation mechanism that rotates the block of the flank polishing mechanism around the contact point between the large-diameter portion polishing grindstone and the drill. When the drill is held with respect to the holder for the drill having a different tip angle of the large diameter portion, the direction of the cutting edge of the large diameter portion of the drill can be adjusted.

  According to the invention which concerns on Claim 11, the large diameter part grinding | polishing mechanism has a slide mechanism which slides the block of a flank grinding mechanism to a right angle direction with respect to the rotating shaft of the rotary grindstone for large diameter part grinding | polishing. Therefore, it is possible to polish the large-diameter portion for drills having different drill diameters and tip angles of the large-diameter portion.

Hereinafter, a preferred embodiment of a stepped drill polishing apparatus according to the present invention will be described with reference to the drawings.
FIGS. 1 to 3 are views showing the overall configuration of a stepped drill polishing apparatus according to the present invention. FIG. 1 is a right front perspective view, FIG. 2 is a left front perspective view, and FIG. 3 is a plan view.
The step drill polishing apparatus according to the present invention polishes a small diameter portion polishing mechanism (100) for polishing a small diameter portion of a step drill (hereinafter sometimes simply referred to as a drill) and a large diameter portion of the step drill. And a large diameter portion polishing mechanism (200).

The small diameter portion polishing mechanism (100) includes a small diameter portion polishing rotary grindstone (10), a second surface polishing mechanism (20), a third surface polishing mechanism (30), and a thinning formation mechanism (40). ing.
The small-diameter polishing grindstone (10) is a disc-shaped grindstone whose peripheral surface is parallel to the rotation axis and whose front end is formed in a cylindrical shape (see FIGS. 2 and 3).
As will be described later, the second-surface polishing mechanism (20), the third-surface polishing mechanism (30), and the thinning formation mechanism (40) are arranged such that the tip of the small-diameter portion of the drill is opposed to the rotating grindstone for polishing the small-diameter portion Thus, they can be brought into contact with each other at different predetermined angles.

The large diameter portion polishing mechanism (200) includes a large diameter portion polishing rotary grindstone (50) and a flank polishing mechanism (60).
The large-diameter polishing grindstone (50) is a disc-shaped grindstone whose peripheral surface is inclined with respect to the rotation axis, and whose diameter gradually increases from the rear end toward the front end ( FIG. 16).
The flank polishing mechanism (60) is capable of bringing the flank of the tip of the large diameter portion of the drill into contact with the large diameter portion polishing grindstone (50) at a predetermined angle.

The stepped drill polishing apparatus according to the present invention has a holder that can hold the drill in a state in which the cutting edge is maintained in a certain direction.
FIG. 4 is a plan view showing the holder (70) in a state where the drill (1) is held.
This holder (70) is used for both the polishing process of the small diameter part by the small diameter part polishing mechanism (100) and the polishing process of the large diameter part by the large diameter part polishing mechanism (200).

The holder (70) has a collet chuck (71) that holds the shank portion of the drill (1) on the distal end side, and a cylindrical shaft portion that is inserted on the proximal end side into a holder insertion through-hole that will be described later. (72).
On the outer peripheral surface of the shaft portion (72), a ring (73) that can move in the length direction and the circumferential direction of the shaft portion and can be fixed to a required position is fitted.
The ring (73) has a screw hole (75). After the ring (73) is moved in the length direction and the circumferential direction along the outer peripheral surface of the shaft portion (72), the ring hole (75) is formed. The ring (73) can be fixed at an appropriate position on the shaft (72) by screwing the screws.
Further, the ring (73) has a groove (74) in which a part in the circumferential direction on the front side is cut out, and the groove (74) is provided in a total of two positions at opposite positions across the center of the ring. It has been. By providing the groove (74) at two symmetrical positions in this way, when the holder (70) is inserted and fixed to a block to be described later, the holder is turned upside down 180 ° (ie, the drill is turned upside down). And positioning) can be fixed. Therefore, it becomes possible to grind two symmetrical places with respect to the center of the drill while holding the drill in the holder.

The stepped drill polishing apparatus according to the present invention is a first drill for adjusting the direction of the cutting edge of the small diameter portion of the drill to a predetermined position when holding the drill (1) with respect to the holder (70). An adjustment mechanism (80) is provided.
5 is a perspective view of the first adjustment mechanism (80), FIG. 6 is a plan view of the first adjustment mechanism (80), and FIG. 6 also shows a partially enlarged view.
The first adjustment mechanism (80) is inserted through the holder insertion through hole (81) having the same diameter as the outer diameter of the shaft portion (72) of the holder (70), and the holder insertion through hole (81). An adjustment block (82) having a fixing mechanism capable of fixing the holder (70) is provided.

The fixing mechanism protrudes horizontally from the end surface of the adjustment block (82) (the end surface on which the ring (73) abuts when the shaft portion of the holder (81) is inserted into the holder insertion through hole (81)). It consists of two pins (87).
The pin (87) fits into the groove (74) of the ring (73) when the shaft portion of the holder (70) is inserted through the holder insertion through hole (81) as shown in the enlarged view on the right side of FIG. Get stuck. This defines the circumferential position of the ring (73) relative to the adjustment block (82). (In other words, it becomes impossible to rotate.)

The first adjusting mechanism (80) is provided with a positioning block (83) that defines the tip position (projection length with respect to the holder) of the drill tip, and the tip can be screwed into the positioning block (83). A rod-like body (84) having a screw and having a core thickness adjustment dial (86) with a scale corresponding to the drill diameter and the drill core thickness at the rear end is provided.
The rod-shaped body (84) has a cutting edge stopper (85) in the middle, and by rotating the core thickness adjustment dial (86), the rod-shaped body (84) is screwed into and out of the positioning block (83). fall back.
The direction of movement of the rod-shaped body (84) at this time is a direction perpendicular to the drill axis when the holder (70) holding the drill is inserted into the through hole (81) for inserting the holder.
The blade edge stopper (85) moves forward by advancing the rod-shaped body (84), and as shown in the enlarged view at the top of FIG. 6, the tip of the blade edge stopper (85) is inserted into the holder (70) inserted through the adjustment block (82). It abuts against the cutting edge of the small diameter portion of the held drill (1). Thereby, the direction of the blade edge | tip of the small diameter part of a drill (1) is adjusted to a fixed direction.

Hereinafter, a method of using the first adjustment mechanism (80) will be described.
The distance between the adjustment block (82) and the positioning block (83) is set to an appropriate constant distance in advance.
First, the holder (70) holding the drill (1) is inserted into the holder insertion through hole (81) of the adjustment block (82), and the tip of the drill (1) is brought into contact with the positioning block (83).
Next, the core thickness adjusting dial (86) is rotated to the scale position corresponding to the drill diameter and the drill core thickness, thereby causing the rod-shaped body (84) to advance, and the tip of the blade edge stopper (85) to be the edge of the small diameter portion of the drill. Abut against.
Thereafter, the ring (73) is externally fitted to the shaft portion (72) of the holder (70), and the position of the groove (74) is adjusted to the position of the pin (87) (the pin is fitted into the groove). In this state, the ring (73) is fixed to the shaft portion (72) by screwing the screw into the screw hole of the ring (73).
Thereby, the direction of the cutting edge of the small diameter portion of the drill (1) is adjusted to be parallel to the groove (74) (parallel to the pin (87)).

The second surface polishing mechanism (20), the third surface polishing mechanism (30), and the thinning formation mechanism (40) are all inserted into the holder having the same diameter as the outer diameter of the shaft portion (72) of the holder (70). It has a block provided with a through hole and a fixing mechanism that can fix the holder inserted through the holder insertion through hole.
Block of the second polishing mechanism (20) (hereinafter referred to as the second polishing block) (21) and block of the third polishing mechanism (30) (hereinafter referred to as the third polishing block) (31) Is formed as a single block.
Specifically, as shown in FIGS. 1 and 2, in a single block, a portion corresponding to the second polishing block (21) is downward and corresponds to the third polishing block (31). Each part is formed upward.
The block (41) of the thinning formation mechanism (40) (hereinafter referred to as a thinning block) (41) is formed as a separate block.

FIG. 7 is a front view showing the second polishing block (21) and the third polishing block (31) formed integrally.
On the end surface of the second polishing block (21), three pins (23) protrude in the horizontal direction around the holder insertion through hole (22). Of the three pins, two are on the left side of the holder insertion through hole (22), and one is on the right side of the holder insertion through hole (22), and connects the left one and the right one. The line is a horizontal line passing through the center of the holder insertion through hole (22).
These three pins (23) constitute the fixing mechanism described above.
Insert the pin (23) into the groove (74) of the ring (73) by inserting the shaft portion (72) of the holder (70) into the through hole (22) for inserting the holder, so that the second position of the holder (70). The circumferential position with respect to the surface polishing block (21) is fixed. At this time, the direction of the tip of the drill held by the holder (70) is fixed horizontally.

On the end surface (31a) of the third polishing block (31), there are two linear protrusions (on the periphery of the through hole (32) for inserting the holder at positions facing each other with the through hole (32) interposed therebetween. 33).
The line connecting the two protrusions (33) passes through the center of the through hole (32) and is inclined at an angle (θ3) with respect to the horizontal line in the same plane as the end face of the third polishing block (31). is doing.
The two protrusions (33) constitute the fixing mechanism described above.
The shaft (72) of the holder (70) is inserted into the holder insertion through-hole (32), and the protrusion (33) is fitted into the groove (74) of the ring (73), whereby the holder (70) 3 The circumferential direction position with respect to the number polishing block (31) is fixed. At this time, the direction of the cutting edge of the drill tip held by the holder (70) is fixed at a predetermined inclination angle.

FIG. 8 is a diagram showing the positional relationship between the rotating grindstone for small diameter portion polishing (10), the second polishing block (21), and the third polishing block (31), (a) is a plan view, (B) is a side view.
As illustrated, the end surface (31a) of the third polishing block (31) is inclined both in the horizontal plane and in the vertical plane with respect to the end surface (21a) of the second polishing block (21). ing.

In the present invention, as shown in FIG. 8, the contact point between the drill and the small-diameter rotating grindstone (10) when the holder is inserted and fixed in the holder insertion through hole of the second polishing block (21), The contact point between the drill and the small-diameter rotating grindstone (10) when the holder is inserted and fixed in the holder insertion through hole of the third polishing block (31) is set to be the same point.
At this time, θ1, θ2, L1, L2, and L3 in the figure satisfy the following relational expression.
√ (L1 × tan θ1) ² + L1 ² = L2
√ (L2 × tanθ2) ² + L2 ² = L3
L3-L4 = L1 (ie, combined extension of L2 and L3 = L1)

Here, the drill center line of the second polishing block (shown as second polishing in FIG. 8) is horizontal, and the drill center line of the third polishing block (shown as third polishing in FIG. 8) By rotating the angle (θ3) in a plane and aligning the compound extension with an angle (θ4) in a side surface with the extension of the drill center line (second surface polishing) of the second surface polishing block, Two rakes using the radius are possible.
In addition, by matching the angles of θ2 and θ3, it is possible to keep the boundary line between the second and third surfaces horizontal, thereby obtaining an ideal shape in which the cutting edge and the boundary line are parallel.
FIGS. 9A and 9B are diagrams showing this ideal-shaped cutting edge, where FIG. 9A is a front view and FIG. 9B is a plan view.

The polishing of the second surface is performed by inserting the holder (70) through the holder insertion through hole (22) of the second surface polishing block (21) installed in the positional relationship shown in FIG. Can be carried out by fixing. At this time, the cutting edge is in the horizontal direction.
With the holder (70) inserted and the cutting edge of the drill applied to the rotating grindstone (10) for polishing the small diameter portion, between the second polishing block (21) and the ring (73) of the holder (70) Since the gap formed is a polishing allowance, the cutting of the second surface on one side is completed by pressing the cutting edge of the drill against the small-diameter polishing rotating grindstone (10) until the gap is eliminated.
Subsequently, if the holder (70) is turned 180 ° and the same operation is performed, the second surface having the same height on the left and right can be formed.
In addition, the grinding surface of the rotating grindstone (10) for polishing the small diameter portion may be either a cylindrical portion (tip surface) or a side surface (circumferential surface). However, when a drill is applied to the cylindrical portion, the second surface is not flat but reverse. As a result, it is necessary to secure a certain diameter. For example, when the diameter is 100 mm or more, the state is almost flat.

The polishing of the third surface is performed by inserting the holder (70) through the holder insertion through hole (32) of the third surface polishing block (31) installed in the positional relationship shown in FIG. Can be carried out by fixing. At this time, the second surface is parallel to the cutting edge.
The width of the No. 2 surface is determined by the polishing amount of the No. 3 surface, but the width of the No. 2 surface needs to be increased or decreased depending on the drill diameter, so it corresponds to various drill diameters, and the width of the No. 2 surface according to the drill diameter In order to increase or decrease, the boundary between the second surface and the third surface is fixed at a fixed position (see FIGS. 10A and 10B).
This concept can be applied even when the boundary line is the center of the circle of the drill, and can be achieved by adjusting the polishing amount of the third surface (see FIG. 10C).

FIG. 11 is a view showing the thinning forming mechanism (40), where (a) is a plan view and (b) is a side view.
As described above, the thinning forming mechanism (40) includes the holder insertion through hole (42) having the same diameter as the outer diameter of the shaft portion (72) of the holder (70), and the holder insertion through hole (42). And a thinning block (41) having a fixing mechanism capable of fixing the holder inserted through the.
The fixing mechanism is the same as that provided in the second polishing block (21), and includes a pin (not shown) projecting around the holder insertion through hole (42) and a ring (73). The circumferential position of the holder (70) with respect to the thinning block (41) is fixed by the provided groove (74).

The thinning block (41) is attached to the base (41a) fixed to the base plate of the apparatus so as to be raised and lowered, and the thinning block (41) is attached as shown by an arrow in FIG. By rotating downward so as to be in a depressed state, the tip of the drill can be applied to the rotating grindstone for polishing the small diameter portion (10).
In addition, a stopper for restricting the downward rotation angle of the thinning block (41) is provided at the front end portion of the base portion (41a) at the position indicated by the alternate long and short dash line in FIG. Thus, the thinning amount can be set to a constant amount.

  The flank polishing mechanism (60) of the large diameter portion polishing mechanism (200) includes a holder insertion through-hole through which the shaft portion (72) of the holder (70) is inserted, and a holder inserted through the holder insertion through-hole. And a flank polishing block (61) provided with a rotation angle regulating mechanism that regulates the rotation of the plate by a predetermined angle.

FIG. 12 is a view showing the flank polishing block (61), where (a) is an external perspective view and (b) is an exploded view.
The flank polishing block (61) includes a block main body (62) fixed to the base plate of the apparatus and a first spiral guide ring fitted into a through hole (62a) formed in the block main body (62). (64) and the second spiral guide ring (65), and a main shaft (63) inserted into the two spiral guide rings.
In a state where the main shaft (63) is inserted, the main shaft (63), the first spiral guide ring (64), and the second spiral guide ring (65) are integrated, and in the through hole (62a) of the block body (62). Rotates integrally.

The main shaft (63) has a cylindrical shape into which the shaft portion (72) of the holder (70) can be inserted, and forms a through hole for holder insertion.
Two protrusions (63a) are formed on the front end surface of the main shaft (63), and these protrusions (63a) are fitted into the grooves (74) of the ring (73) to thereby hold the holder with respect to the main shaft (63). The circumferential position of (70) is fixed.
In the figure, (63b) is a hole into which a screw for fixing the main shaft (63) and the holder (70) is inserted.

On the front end surface of the block main body (62), stopper pins (66) are respectively provided in the horizontal direction at two locations around the through hole (62a).
In addition, a pin hole is formed on the upper surface of the block body (62), and the rotation guide pin (67) is inserted into the pin hole so as to protrude into the through hole (62a).
The protruding portion of the rotation guide pin (67) is inserted into a gap (hereinafter referred to as a guide pin groove) formed between the first spiral guide ring (64) and the second spiral guide ring (65).

FIG. 13 is a plan view of the flank polishing block (61), (a) is a view showing the block body (62), and (b) is a view in which the block body (62) is omitted.
In a state where the rotation guide pin (67) is inserted into the guide pin groove (68), when the main shaft (63) is rotated clockwise, the main shaft advances with respect to the block main body (62), and when rotated counterclockwise, the block main body (62 ) Moves the spindle backward. The amount of movement at this time is determined by the shape (angle) of the guide pin groove (68).

The shape of the guide pin groove (68) is such that the amount of axial movement (advance) of the drill with respect to the amount of rotation of the main shaft (63) (the amount of rotation of the holder inserted through the main shaft) is small at the initial stage of rotation. It is preferable to set so as to increase as it approaches (see FIG. 14).
By setting in this way, an ideal shape can be formed in which the cutting edge angle is gentle and many flank faces can be taken. When this is set linearly as shown by a broken line in FIG. 14, the edge angle becomes steep and the cutting resistance increases.

The second spiral guide ring (65) is provided with a bar (69) protruding in the tangential direction of the ring.
The bar (69) and the stopper pin (66) regulate the rotation amount (rotation angle) of the main shaft (63) to a constant amount. That is, the stopper pin (66) and the bar (69) constitute a rotation angle regulating mechanism that regulates the holder (70) inserted through the main shaft (63) (holder insertion through hole) to be rotatable by a predetermined angle. Yes.

FIG. 15 is an explanatory diagram of the rotation angle regulating mechanism.
When the main shaft (63) is rotated rightward, as shown in (a), the bar (69) hits the left stopper pin (66) and stops rotating, and when the main shaft (63) is rotated leftward, (b ), The bar (69) hits the stopper pin (66) on the right side to stop the rotation.

FIG. 16 is a diagram showing a method of polishing the flank of the large diameter portion by the flank polishing mechanism (60).
First, the holder is inserted and fixed in the holder insertion through hole (main shaft) of the flank polishing block (61), and the cutting edge (1a) of the large diameter portion of the drill is fixed to the rotating grindstone (50) for polishing the large diameter portion. It is set as the state applied in parallel with the front end surface (see FIG. 16A).
Next, as shown in FIGS. 13 and 15, the main shaft (63) is rotated rightward to advance the drill (1) while rotating the drill (1). As a result, the flank is cut more than the cutting edge (see FIG. 16B).

The apparatus according to the present invention has a second adjustment mechanism (90) for adjusting the orientation of the cutting edge of the large diameter portion of the drill when holding the drill (1) with respect to the holder (70). Yes.
FIG. 17 is a view showing the second adjustment mechanism (90).
The second adjustment mechanism (90) includes a base (91) fixed to the base plate of the apparatus, and two arms (which can be turned downward) provided on the upper end of the base (91). 92) (93) and a stopper (94) for restricting the downward rotation of these arms.

Edge detection stays (95) are attached to the tips of the two arms (92) and (93), respectively.
The edge detection stay (95) comes into contact with (hangs on) the cutting edge and the groove of the large diameter portion of the drill when the holder is inserted and fixed in the holder insertion through hole (main shaft) of the flank polishing block (61). The direction of the cutting edge is set, and is set at a position in consideration of the polishing allowance in advance.
The arm (92) is used when the tip angle of the large diameter portion is 80 to 90 °, and the arm (93) is used when the tip angle of the large diameter portion is 120 to 180 °. The mounting angles of the edge detection stay (95) are different from each other.

FIG. 18 is a view showing a method of adjusting the direction of the blade edge of the large diameter portion by the second adjustment mechanism (90), and FIG. 19 is a partially enlarged view thereof.
First, the drill (1) is set in the holder (70) and inserted through the main shaft (63).
Next, the edge detection stay (95) is rotated downward to contact the cutting edge and groove of the large diameter portion of the drill.
Subsequently, in a state where the main shaft (63) and the holder (70) are fixed by screwing, a ring (73) is fitted into the holder (70), and two protrusions (63a) formed on the front end surface of the main shaft (63). ) Is inserted into the groove (74) of the ring (73) to set the circumferential position of the holder (70) with respect to the main shaft (63), and in this state, the ring (73) is fixed to the holder (70). Thereby, a blade edge and a groove | channel (74) are kept parallel.

18 and 19, (a) shows a state where the arm (92) is used, and (b) shows a state where the arm (93) is used.
As shown in the figure, two types of arms can be used properly according to the size of the tip angle of the large diameter portion.
Here, in the state of (a) and the state of (b), the angle of the drill shaft with respect to the arm is different.
This angle change is performed by using the flank grinding block (61) of the second adjustment mechanism (90), with the contact point between the large-diameter grinding grindstone (50) and the drill (1) as the center. The rotation can be performed by a rotating mechanism (described later).

The large-diameter portion polishing mechanism (200) includes a slide mechanism that slides the flank polishing block (61) in a direction perpendicular to the rotation axis of the large-diameter portion polishing grindstone (50). .
20A and 20B are diagrams showing a slide mechanism and a rotation mechanism, where FIG. 20A is a front view and FIG. 20B is a plan view.
The rotating mechanism has a contact point (3) between the rotating grindstone for polishing the large diameter portion (50) and the drill (1), as illustrated by the arrow in the part labeled “angle change” in FIG. The plate-like first slider (97) to which the flank polishing block (61) is fixed can be rotated along a groove (96) formed in an arc shape centering on the plate.

FIG. 21 is a plan view of the slide mechanism, and FIG. 22 is a view for explaining the structure of the slide mechanism.
The slide mechanism includes a slide rail (4), a second slider (98) to which a flank polishing block (61) that slides along the slide rail (4) is fixed, and a rack and pinion mechanism that is rotated. A slide dial (5) for sliding the second slider (98) along the slide rail (4), a first stopper guide (6) fixed to the second slider (98) and moving together with the plate, and a first A second stopper guide (7) fixedly arranged on the front side of the stopper guide (6) and a tip of the second stopper guide (7) are inserted into a groove formed in the first stopper guide (6) through the second stopper guide (7). Screw-type slide stopper (8) and the left side of the slide stopper (8) (the rotating grindstone (50) side for polishing the large diameter portion) and beyond There is provided with a threaded point of contact stopper (9) which is not inserted into the groove of the inserted and the first stopper guide (6) to the second stopper guide (7), and a slide lock (2).

  As shown in FIG. 22, when the contact point stopper (9) is tightened, it is fixed to the second stopper guide (7). On the other hand, when the slide stopper (8) is tightened, the first stopper guide (6) is fixed, but the second stopper guide (7) is not fixed and can move left and right.

By rotating the slide dial (5), the second slider (98) to which the flank polishing block (61) is fixed slides along the slide rail (4).
Here, since the second slider (98) and the first stopper guide (6) are fixed, the first stopper guide (6) moves together with the second slider (98).
Since the slide stopper (8) is fastened and fixed to the first stopper guide (6), the slide stopper (8) extends along the groove formed in the second stopper guide (7) together with the first stopper guide (6). Move. The movement in the right direction stops when the right end of the groove is reached, and the movement in the left direction stops when it hits the contact point stopper (9) fastened and fixed to the second stopper guide (7).

The slide lock (2) is a screw for fixing the position of the second slider (98) when it hits the contact point stopper (9).
By fixing the position of the second slider (98) with the slide lock (2), the second slider (98) is rotated by the rotation of the grindstone when the drill is applied to the rotating grindstone (50) for polishing the large diameter portion. Is prevented from moving in the right direction (direction away from the grindstone).

In polishing the large diameter portion, the boundary point between the large diameter portion rotating grindstone (50) and the large diameter portion and the small diameter portion of the drill depending on the diameter of the drill and the tip angle of the large diameter portion (80 to 180 °). The contact point with (1c) (refer FIG. 23) changes variously.
By having the slide mechanism as described above, it is possible to polish the large-diameter portion for various drills having different drill diameters and tip angles of the large-diameter portion.

The tightening positions of the slide stopper (8) and the contact point stopper (9) are set according to the drill diameter of the small diameter portion and the tip angle of the large diameter portion.
The drill is set by rotating the slide dial (5) to move the flank polishing block (61) in the right direction and letting the spindle (63) escape from the contact point (3).
Polishing of the flank of the large-diameter portion of the drill is performed by rotating the slide dial (5) so that the boundary point between the large-diameter portion and the small-diameter portion of the drill is applied to the rotating grindstone for polishing the large-diameter portion (50). ) By rotating.
When the drill is turned 180 °, the flank polishing block (61) is moved rightward and the main shaft (63) is released from the contact point (3).

  The present invention is suitably used for re-polishing stepped drills widely used in the automobile industry and the like.

1 is a right-side front perspective view showing an overall configuration of a stepped drill polishing apparatus according to the present invention. 1 is a left front perspective view showing the overall configuration of a stepped drill polishing apparatus according to the present invention. It is a top view which shows the whole structure of the stepped drill grinding | polishing apparatus which concerns on this invention. It is a top view which shows the holder of the state holding the drill. It is a perspective view of the 1st adjustment mechanism. It is a top view of the 1st adjustment mechanism. It is a front view which shows the 2nd surface polishing block and the 3rd surface polishing block which were formed integrally. It is a figure which shows the rotary grindstone for small diameter part grinding | polishing, the 2nd surface grinding | polishing block, and the 3rd surface grinding | polishing block, (a) is a top view, (b) is a side view. It is a figure which shows the blade edge | tip of an ideal shape, (a) is a front view, (b) is a top view. It is the figure which fixed the boundary of the 2nd surface and the 3rd surface to the fixed position. It is a figure which shows a thinning formation mechanism, (a) is a top view, (b) is a side view. It is a figure which shows the block for flank grinding | polishing, Comprising: (a) is an external appearance perspective view, (b) is an exploded view. It is a top view of the block for flank grinding | polishing, (a) is the figure which showed the block main body, (b) is the figure which abbreviate | omitted the block main body. It is a graph which shows the relationship between the rotation amount (angle) of a main axis | shaft at the time of employ | adopting the shape of an ideal guide pin groove | channel, and the moving amount (advance amount) of the axial direction of a drill. It is explanatory drawing of a rotation angle control mechanism. It is a figure which shows the grinding | polishing method of the flank of a large diameter part by a flank grinding | polishing mechanism. It is a figure which shows a 2nd adjustment mechanism. It is a figure which shows the adjustment method of direction of the blade edge | tip of the large diameter part by a 2nd adjustment mechanism. It is the elements on larger scale of FIG. It is a figure which shows a slide mechanism and a rotation mechanism, (a) is a front view, (b) is a top view. It is a top view of a slide mechanism. It is a figure explaining the structure of a slide mechanism. It is a figure which shows the boundary point of the large diameter part and small diameter part of a drill. It is a figure which shows the shape of a step drill.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Small diameter part polishing mechanism 200 Large diameter part polishing mechanism 10 Small diameter part polishing rotary grindstone 20 Second surface polishing mechanism 21 Second surface polishing block 30 Third surface polishing mechanism 31 Third surface polishing block 40 Thinning forming mechanism 41 Thinning Block 50 Large-diameter grinding rotary grindstone 60 Flank grinding mechanism 70 Holder 71 Collet chuck 72 Shaft 73 Ring 74 Groove 81 Holder insertion through-hole 82 Adjustment block 83 Pin (fixing mechanism)
85 Cutting edge stopper 63 Spindle 92 Arm 93 Arm 95 Edge detection stay

Claims (11)

A polishing apparatus for a stepped drill having a small diameter part, a large diameter part and a shank part,
A small diameter portion polishing mechanism for polishing a small diameter portion, and a large diameter portion polishing mechanism for polishing a large diameter portion,
The small-diameter portion polishing mechanism is a second-surface polishing that is set so that a small-diameter portion polishing grindstone and a tip portion of the small-diameter portion of the drill can be brought into contact with the small-diameter portion grindstone at different predetermined angles A mechanism, a third surface polishing mechanism, and a thinning formation mechanism,
The large-diameter portion polishing mechanism is set so that the large-diameter portion polishing grindstone and the flank of the tip of the large-diameter portion of the drill can be brought into contact with the large-diameter portion polishing grindstone at a predetermined angle. A stepped-grind polishing apparatus comprising a flank polishing mechanism. A holder capable of holding the drill in a state in which the cutting edge is maintained in a certain direction;
The second surface polishing mechanism, the third surface polishing mechanism, and the thinning forming mechanism include a holder insertion through-hole through which the holder is inserted, and a fixing mechanism that can fix the holder inserted through the holder insertion through-hole. And a block comprising
2. The step drill according to claim 1, wherein when the holder is inserted and fixed in the holder insertion through-hole of the block, the tip of the drill comes into contact with the small-diameter polishing grindstone at a predetermined angle. Polishing equipment.   Contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in the holder insertion through-hole of the block of the second surface polishing mechanism, and for insertion of the block of the third surface polishing mechanism into the holder The step drill drill polishing apparatus according to claim 2, wherein a contact point between the drill and the small-diameter rotating grindstone when the holder is inserted and fixed in the through hole is the same point. A holder capable of holding the drill in a state in which the cutting edge is maintained in a certain direction;
The flank polishing mechanism includes a holder insertion through-hole through which the holder is inserted, and a rotation angle restriction mechanism that restricts the holder inserted through the holder insertion through-hole to be rotatable by a predetermined angle. Have
When the holder is inserted and fixed in the holder insertion through-hole of the block, the flank of the drill comes into contact with the rotating grindstone for polishing the large diameter portion at a predetermined angle, and the drill is rotated when the holder is rotated by a predetermined angle. 2. The step drill polishing apparatus according to claim 1, wherein the step advances in the axial direction.   5. The polishing apparatus for a stepped drill according to claim 4, wherein an advance amount in the axial direction of the drill with respect to an amount of rotation of the holder is small at an initial stage of rotation and increases as it approaches an end stage. The holder has a collet chuck that holds the shank portion of the drill on the distal end side, and a shaft portion that is inserted into the holder insertion through hole on the proximal end side,
On the outer peripheral surface of the shaft portion, a ring that can move in the length direction and the circumferential direction of the shaft portion and can be fixed to a required position is fitted, and the ring has a groove in a part of the circumferential direction. Have
The said fixing mechanism consists of a pin projecting from the block end face, and the circumferential position of the ring with respect to the block is defined by the pin being fitted into the groove. Polishing equipment for step drills. A first adjusting mechanism for adjusting the direction of the cutting edge of the small diameter portion of the drill when holding the drill with respect to the holder;
The first adjustment mechanism includes:
An adjustment block comprising a holder insertion through hole through which the holder is inserted, and a fixing mechanism capable of fixing the holder inserted through the holder insertion through hole;
A cutting edge stopper that is movable in a direction perpendicular to the drill axis and that sets the direction of the cutting edge by contacting the cutting edge of the small diameter portion of the drill held by a holder inserted through the adjustment block. The polishing apparatus for stepped drills according to claim 2, wherein: A second adjusting mechanism for adjusting the orientation of the cutting edge of the large-diameter portion of the drill when holding the drill with respect to the holder;
The second adjustment mechanism is
When the holder is inserted and fixed in the holder insertion through hole of the block of the flank polishing mechanism, it has an edge detection stay for setting the direction of the blade edge by contacting the blade edge and the groove of the large diameter portion. The polishing apparatus for a step drill according to claim 4.   9. The polishing apparatus for a step drill according to claim 8, wherein the edge detection stay is attached to a tip of an undulating arm.   The second adjustment mechanism includes a rotation mechanism that rotates a block of the flank polishing mechanism around a contact point between the large-diameter portion polishing grindstone and the drill. The polishing apparatus for step drills according to 8 or 9.   The large-diameter portion polishing mechanism has a slide mechanism that slides a block of the flank polishing mechanism in a direction perpendicular to a rotation axis of the rotary grindstone for polishing the large-diameter portion. The polishing apparatus for step drills according to any one of 1 to 10.

Images